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Hammerhead Shark

Oceanography-03 4-22-10
by

Drew Robbins

on 3 May 2010

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Transcript of Hammerhead Shark

Hammerhead Shark Drew Robbins Taxonomy Class: Chondrichthyes Order: Carchariniformes Family: Sphyrnidae Genus: Syhyrna Species: mokarran What the... ?! Can grow up to 20 feet in length Can weigh up to 1000 pounds Most maneuverable shark in the world Hammerheads are born with their head bent backwards so they do not get stuck in the vagina Habitat and Distribution Live in warm tropical waters Australia and South America Able to survive in a large range of depths 3 feet to 260 feet One of the only sharks to swim in schools referred to as "shoals" Population is declining although exact figures are not known Food Sharks Rays Squid Fish Octopus Skates Tall, long dorsal fin with a slight curve in adults Relatively long second dorsal fin Dark fin tips Broad blades that extend more than 1/3 the length of the animal Long caudle fin Shark Features History Evolved from the Winghead Shark
first shark to have "hammer" like head Females give birth to live young
viviparous A species of hammerhead called the Bonnethead Shark was found in 2007 to be able to produce live young asexually The average gestation period is around 10 to 12 months Did this through automictic parthenogenesis, in which a female's ovum fuses with a polar body to form a zygote without the need for a male. This was the first shark known to do this. Each litter contains anywhere from 12 to 15 pups Relationship with Humans Only 3 species of hammerheads are dangerous to humans
Scalloped, Great, and Smooth 33 attacks since 1580 on record
0 deaths Test Question How many species of Hammerheads are dangerous to humans? Three: scalloped, great, and smooth Bibliography en.wikipedia.org/wiki/Hammerhead_shark animals.nationalgeographic.com/animals/fish/hammerhead-shark/ http://marinebio.org/species.asp?id=87 www.sdnhm.org/kids/sharks/shore-to-sea/hammerhead.html
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